The sisters attended the CFDA Awards in New York on Monday night, looking pretty much as you'd expect.
MKO bandaged herself from neck to ankle in a vintage black Issey Miyake gown that swallowed up her petite frame, adding some color with gemstone drop earrings.
Elizabeth also went with an all-black look, wearing high-waisted trousers and boxy blazer by The Row.
Both girls seemed to have styled their hair as an afterthought, if at all.
Lizzie usually looks very chic, so we'll have to attribute this outfit to Mary-Kate's influence!
[Image via Retna.]